[media] V4L: Use NULL pointer instead of plain integer in v4l2-ctrls.c file
Fixes the following sparse warning: drivers/media/video/v4l2-ctrls.c:2123:43: warning: Using plain integer as NULL pointer Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org> Acked-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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